Two plane mirrors are inclined at an angle of 90 degree to each other. The number of images formed for an object placed in between the two will be _?

Answer: [B] Three

The number of images is given by the below formula:
http://www.gktoday.in/wp-content/uploads/2016/02/360-theta.png
If the calculated value is not a whole number, then the number of images will be rounded off to the nearest integer. 

This question is a part of GKToday's Integrated IAS General Studies Module